AU657115B2 - Impeller annular seal - Google Patents
Impeller annular seal Download PDFInfo
- Publication number
- AU657115B2 AU657115B2 AU12187/92A AU1218792A AU657115B2 AU 657115 B2 AU657115 B2 AU 657115B2 AU 12187/92 A AU12187/92 A AU 12187/92A AU 1218792 A AU1218792 A AU 1218792A AU 657115 B2 AU657115 B2 AU 657115B2
- Authority
- AU
- Australia
- Prior art keywords
- impeller
- annular seal
- intake opening
- annular
- rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000012530 fluid Substances 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 10
- 230000000295 complement effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
- F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Our Ref: 422422 P/00/011 Regulation 3:2
AUSTRALIA
Patents Act 1990 7115
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT e o o o o s r o Applicant(s): Address for Service: Invention Title: Warman International Limited 1 Marden Street ARTARMON NSW 2064
AUSTRALIA
DAVIES COLLISON CAVE Patent Trade Mark Attorneys Level 10, 10 Barrack Street SYDNEY NSW 2000 Impeller annular seal The following statement is a full description of this invention, including the best method of performing it known to me:- 5020 The present invention relates to an impeller annular seal for centrifugal pumps for the pumping of slurries and particularly abrasive slurries. A problem in pumping slurries, containing abrasive solids in suspension, is the abrasive action of the suspended solids and the subsequent wear on the components of the pump. This subsequent wear causes enlargement of the clearances between the rotary and stationary members with a consequential leakage of the fluid, pumped, back bet;veen the clearance between the annular seal and the subsequent serious loss of head and efficiency, and the reduction in the serviceable life of the wearing parts, particularly the impeller and parts of the casing or casing liners adjacent this area of the impeller.
A prior art means commonly employed to alleviate this problem is illustrated in Figure 1 which provides a close clearance or annular seal between the impeller (2) and side liners or casing which acts to restrict the fluid in the high pressure area (4) at the impeller periphery from returning to the low pressure area adjacent the inlet 00" The annular seal is annular and concentric to the impeller eye. The subsequent wear of the components is concentrated on this annular area as a result of the high relative ooooo S• velocities of the returning or rejoining fluid and subsequent generated turbulence.
•o The fluid escaping through the annular seal between the impeller and side liner rejoins the main flow of fluid travelling down the inlet of the pump into the impeller inlet Because this rejoining fl lid has high velocity, it tends to distort the bulk of the flow into the impeller leading to formation of vortices and turbulence which in turn causes excessive wear on the leading edge of the impeller 25 vanes.
a Many designs of annular seal exist, all with two primary aims: 1) to provide the greatest restriction to flow, and 2) to minimise wear. To this end, pumps used for pumping abrasive solids in suspension have experienced particular difficulty in achieving satisfactory wear life in this annular wear area.
The problem with prior art annular seals is that the rejoining fluid joins the main flow of fluid at a large angle (usually substantially perpendicular) to this main flow LI b:\arsspe.003\12187.92\1 f.
'xr i -2and in some cases is angled to flow against the direction of the main flow With such a large angle, separation of the main flow from the pipe wall is inevitable and a vortex of high velocity fluid forms just inside the inlet to the impeller (2) downstream of the annular seal This formation of vortices is one of the main causes of wear at the impeller vanes leading edge (13).
Existing pumps have, as a result of this localised wear, experienced particular difficulty in achieving satisfactory life in this annular ring area surrounding the impeller eye.
The present invention seeks to ameliorate this existing problem by providing an annular seal design which minimises overall wear on both the impeller and the adjacent liner of the centrifugal slurry pump.
15 According to one aspect of the present invention there is provided a centrifugal slurry pump comprising: an impeller having two substantially parallel rotatable members aligned to rotate about a common axis of rotation and defining a central intake opening in one of the rotatable members aligned along the axis of rotation, 20 a plurality of substantially radially extending primary vanes extending between the rotatable members, and extending generally radially from the axis of rotation, so as to, when said impeller is installed in a pump casing, pump liquid through the pump, and %1 an annular area around the central intake opening of the impeller, said area having its surface at least adjacent the intake opening sloping towards the intake opening in the direction of the fluid flow at an angle from between 20' to 450 to that of the axis of rotation of the impeller; and a liner or pump casing enclosing said impeller and having an inlet aligned with the central intake opening of said one of the rotatable members, wherein the liner or pump casing has an annular area overlaying and substantially complementary in shape to the said annular area of the impeller to thereby form an annular seal of a minimal clearance between these two areas and wherein the annular seal N i has a minimum width of not less than 0.05 of the diameter of the intake opening.
R" 7 n p:\wpdocs\dysspecic\ 12187.92 z, N. i- -3- The present invention will now be described by way of example with reference to the following figures in which: Figure 2 illustrates a centrifugal pump according to one embodiment of the present invention; Figure 3 illustrates a centrifugal pump according to a second embodiment of the present invention; Figure 4 illustrates a centrifugal pump according to a further embodiment of the present invention; and Figure 5 illustrates an impeller according to another embodiment of the present invention.
It has been found during testing that the angle at which the returning fluid (9) rejoins the main flow is critical in controlling the recirculation and subsequent wear adjacent the inlet of the impeller by the returning fluids from the high pressure area to the low pressure area at the inlet of the impeller S° oIt has been found by the inventor that by decreasing the angle of the inlet of the 0•••o clearance of the annular seal relative to the axis of rotation facing towards the inlet opening of the impeller with the direction of flow into the impeller) that there has been a decrease in wear on the casing liner and impeller as opposed to the S* wear which occurs in prior art pumps.
The profile of the clearance of the annular seal (10) and (11) can be straight, as shown in Figure 2, or respectively curved as shown in Figure 3, and preferably the and 60•.The annular seals 10, 11) have been highlighted for clarity sake.
Thus by reducing the angle at which the rejoining fluid joins the main fluid wear on the impeller is greatly reduced because the main fluid remains attached to the inlet pipe wall and the formation of vortices at the vane leading edge (13) is lessened or eliminated.
Experimental testing has shown that impeller wear is significantly reduced when b:Aarsspe.003\1 2187.92\3 -4the angle of the rejoining flow is between 20' and 45' to the axial centre line.
The maximum length of the seal formed is not critical. However, as shown in Figure 5, the minimum width of the seal should not be less than 0.05 of the diameter of tile intake opening of the impeller for effective scaling. This form of annular seal construction can be used with any other construction of the pumps including radial expelling vanes as shown in Figure 4.
It should be obvious to people skilled in the art that modifications and alterations can be made to the annular seal described in the above description without departing from the spirit and scope of the present invention.
pAwpdocs\dys\spcde\ 12187.92
Claims (4)
1. A centrifugal slurry pump comprising: an impeller having two substantially parallel rotatable members aligned to rotate about a common axis of rotation and defining a central intake opening in one of the rotatable members aligned along the axis of rotation, a plurality of substantially radially extending primary vanes extending between the rotatable members, and extending generally radially from the axis of rotation, so as to, when said impeller is installed in a pump casing, pump liquid through the pump, and i '10 an annular area around the central intake opening of the impeller, said area having *5 S. its surface at least adjacent the intake opening sloping towards the intake opening in the direction of the fluid flow at an angle from between 20° to 450 to that of the axis of rotation of the impeller; and a liner or pump casing enclosing said impeller and having an inlet aligned with the central intake opening of said one of the rotatable members, wherein the liner or pump casing has an annular area overlaying and substantially complementary in shape to the said annular area of the impeller to thereby form an S° *annular seal of a minimal clearance between these two areas, and wherein the annular seal has a minimum width of not less than 0.05 of the diameter of the intake opening.
2. A centrifugal slurry pump according to Claim 1 wherein said annular seal has its surface of the annular area flat in profile.
3. A centrifugal slurry pump according to Claim 1 wherein said annular seal has its S 25 surface of the annular area curved in profile. p:\wpdocs\dys\specic\ 12187.92 1' T V:
6- 4. A centrifugal slurry pump according to any one of Claims I to 3 wherein said one rotatable member has expelling vanes located on its surface adjacent the liner or casing. A centrifugal slurry pump substantial-ly as hereinbefore described with refertnce to Figures 2 to 5 of the acr.,-tpanying drawings. DATED this 20th day of December, 1994 WARMAN INTERNATIONAL LIMITED 10 By its Patent Attorneys DAVIES COLLISON CAVE 0*e a e S S *5S* S S *5 S S *5 S *5 e S S. '7 p:\%Ypdocs\dys'spccie\121 97 92 i -7- ABSTRACT Centrifugal pumps suffer from wear of the annular seal between the impeller and the casing or side liner due to the returning flow of the rejoining fluid The present invention ameliorates this problem by having the clearance of the annular seal 11) at least adjacent the inlet of the impeller sloping, in the direction of the main fluid flow into the impeller inlet at an angle of between 0o and 600 to the axis of rotation of the impeller o000i 0 0 b:\arsspe.003\12187.92\7
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU12187/92A AU657115B2 (en) | 1991-03-22 | 1992-03-10 | Impeller annular seal |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPK5249 | 1991-03-22 | ||
| AUPK524991 | 1991-03-22 | ||
| AU12187/92A AU657115B2 (en) | 1991-03-22 | 1992-03-10 | Impeller annular seal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1218792A AU1218792A (en) | 1992-09-24 |
| AU657115B2 true AU657115B2 (en) | 1995-03-02 |
Family
ID=25614717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU12187/92A Expired AU657115B2 (en) | 1991-03-22 | 1992-03-10 | Impeller annular seal |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU657115B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3221661A (en) * | 1961-12-18 | 1965-12-07 | Electronic Specialty Co | Low-suction head pumps |
| US3881840A (en) * | 1973-09-05 | 1975-05-06 | Neratoom | Centrifugal pump for processing liquids containing abrasive constituents, more particularly, a sand pump or a waste-water pumper |
| DE3524297A1 (en) * | 1985-07-02 | 1987-01-15 | Sulzer Ag | Centrifugal pump |
-
1992
- 1992-03-10 AU AU12187/92A patent/AU657115B2/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3221661A (en) * | 1961-12-18 | 1965-12-07 | Electronic Specialty Co | Low-suction head pumps |
| US3881840A (en) * | 1973-09-05 | 1975-05-06 | Neratoom | Centrifugal pump for processing liquids containing abrasive constituents, more particularly, a sand pump or a waste-water pumper |
| DE3524297A1 (en) * | 1985-07-02 | 1987-01-15 | Sulzer Ag | Centrifugal pump |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1218792A (en) | 1992-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired | ||
| NA | Applications received for extensions of time, section 223 |
Free format text: AN APPLICATION TO EXTEND THE TIME FROM 20010310 TO 20020321 IN WHICH TO PAY A RENEWAL FEE HAS BEEN LODGED |
|
| NB | Applications allowed - extensions of time section 223(2) |
Free format text: THE TIME IN WHICH TO PAY A RENEWAL FEE HAS BEEN EXTENDED TO 20020321 |
|
| HB | Alteration of name in register |
Owner name: WEIR WARMAN LTD Free format text: FORMER NAME WAS: WARMAN INTERNATIONAL LIMITED |